Finding the Third Proportional to 1,139.25 and 2,412.75

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.25 : 2,412.75 = 2,412.75 : x
2. Step 2: Convert to fraction form
   1,139.25/2,412.75 = 2,412.75/x
3. Step 3: Cross multiply
   1,139.25x = 2,412.75 × 2,412.75
4. Step 4: Simplify right side
   1,139.25x = 5,821,362.56
5. Step 5: Solve for x
   x = 5,821,362.56/1,139.25
6. Step 6: Final answer
   x = 5,109.82